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Vishay General Semiconductor - Diodes Division SMBJ18CAHE3_B/I
- Part No.:
- SMBJ18CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CAHE3_B/I.pdf
- Description:
- 600W,18V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,551
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Product details
Overview
SMBJ18CAHE3_B/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 29.2 V maximum clamping voltage (VC) at 20.5 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ18CAHE3_B/I datasheet, SMBJ18CAHE3_B/I pinout, SMBJ18CAHE3_B/I application, or SMBJ18CAHE3_B/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (−55 to +150 °C), and compliance with UL 497B surge protector classification.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the 10/1000 µs surge rating reflects standardized lightning and switching transient immunity per ANSI/IEEE C62.35.
The device is rated for 600 W peak pulse power under repetitive 0.01% duty cycle conditions and exhibits fast response time (<1.0 ps), low incremental surge resistance, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its AEC-Q101 qualification confirms suitability for automotive electronics where reliability under thermal cycling and mechanical stress is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing margin. |
| VBR min/max | 20.0 V / 22.1 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 600 W - Peak transient energy handling capacity; supports IEC 61000-4-5 Level 4 surge immunity design. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in high-ambient environments like engine control units. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; guides PCB thermal layout. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking; matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix), MSL Level 1, 260 °C reflow compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; symmetrical with cathode in bidirectional mode | Enables clamping in both voltage polarities; no external polarity dependency required in layout. |
| Cathode | Current exit terminal in forward bias; electrically identical to anode for bidirectional operation | Eliminates need for orientation-aware placement; simplifies automated assembly and reduces BOM variants. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Provides symmetrical overvoltage protection on AC, differential, or floating signal lines without polarity constraints. |
| 600 W peak pulse power (10/1000 µs) | Supports robust immunity against IEC 61000-4-5 surge events up to Level 4 (4 kV line-earth, 2 kV line-line). |
| AEC-Q101 qualified | Validated for automotive applications including powertrain, body control, and ADAS modules requiring long-term field reliability. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during transients, reducing stress on downstream 3.3 V or 5 V logic interfaces. |
| UL 497B recognized (QVGQ2) | Meets Underwriters Laboratories requirements for telecom and industrial surge protection system certification. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate driver signal lines against inductive kickback from relay and solenoid switching. IC Role / Device Role / Timing Role: Bidirectional TVS clamp limiting transient spikes to <29.2 V during 20.5 A surges. Use Value: Prevents false triggering or latch-up in isolated gate drivers and microcontroller GPIOs exposed to 100 V+ transients. |
Use Scenario: Surge suppression on LIN bus lines and sensor inputs (e.g., ambient temperature, door position) in vehicle interior modules. IC Role / Device Role / Timing Role: Fast-response voltage clamp maintaining signal integrity during load dump and jump-start events. Use Value: Ensures uninterrupted communication and sensing functionality under ISO 7637-2 Pulse 1/2a/5a stress conditions. |
| Telecom Power Supply Inputs | Consumer IoT Sensor Nodes |
Use Scenario: Input-stage protection of 24 V DC power rails feeding PoE-powered switches and base station controllers. IC Role / Device Role / Timing Role: Primary transient shunt absorbing 600 W surges before they reach DC-DC converters and PMICs. Use Value: Extends mean time between failures (MTBF) by preventing cumulative degradation of input capacitors and MOSFETs. |
Use Scenario: ESD and EFT protection on I²C/SPI lines connecting MCU to environmental sensors (humidity, pressure, motion). IC Role / Device Role / Timing Role: Low-capacitance (<100 pF typical) bidirectional clamp preserving signal rise/fall times up to 1 MHz. Use Value: Maintains timing accuracy and data integrity without adding jitter or signal distortion in battery-operated edge devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CAHM3_B/I | Halogen-free variant with identical electrical specs and AEC-Q101 qualification; same SMB package and pinout. | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy. | Choose SMBJ18CAHM3_B/I if RoHS + halogen-free material declaration is required for final product certification. |
| SMAJ18CAHE3_A | Lower power rating (400 W PPPM), larger package (SMA/DO-214AC), higher RθJA (140 °C/W), same VWM/VBR/VC. | Less effective for high-energy surges; requires larger PCB area and offers reduced thermal performance. | Use SMAJ18CAHE3_A only when SMB footprint is unavailable and 400 W surge margin suffices for the application. |
Compared with SMBJ18CAHE3_B/I, the HM3 variant adds halogen-free compliance without trade-offs, while the SMAJ18CAHE3_A sacrifices 33% peak power and thermal efficiency for legacy package compatibility-making SMBJ18CAHE3_B/I optimal for space-constrained, high-reliability designs.
Availability
SMBJ18CAHE3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supply inputs requiring stable component supply, AEC-Q101 validation, and UL 497B recognition.
Supply support for SMBJ18CAHE3_B/I includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets high-energy transient suppression in automotive, industrial, and telecom systems, with design focus on low clamping voltage, fast response, and robust packaging for automated SMT assembly.
FAQ
What is the standoff voltage rating of SMBJ18CAHE3_B/I?
The SMBJ18CAHE3_B/I has a maximum reverse standoff voltage (VWM) of 18 V, meaning it remains non-conductive under normal operating conditions up to this DC or RMS voltage level. This value ensures compatibility with 15 V and 18 V power rails and signal interfaces while providing sufficient margin before breakdown at 20.0–22.1 V. The SMBJ18CAHE3_B/I maintains low leakage (<1.0 µA) at VWM, supporting precision analog and low-power digital circuits.
Is SMBJ18CAHE3_B/I suitable for automotive applications?
Yes, SMBJ18CAHE3_B/I is AEC-Q101 qualified, having passed stress tests including temperature cycling, high-temperature reverse bias, and ESD per JESD22 standards. Its −55 to +150 °C operating range, MSL Level 1 moisture sensitivity, and UL 497B recognition make it appropriate for under-hood and cabin-mounted automotive electronics. The SMBJ18CAHE3_B/I is explicitly listed in Vishay's AEC-Q101 automotive ordering codes (HE3 suffix).
What does the "CA" suffix indicate in SMBJ18CAHE3_B/I?
The "CA" suffix denotes a bidirectional configuration, meaning the SMBJ18CAHE3_B/I provides symmetrical clamping in both positive and negative voltage directions. Unlike unidirectional "A" variants, it has no cathode band marking and functions identically regardless of voltage polarity-ideal for protecting AC-coupled lines, differential buses (e.g., RS-485), or floating sensor inputs where polarity reversal may occur. This eliminates orientation-dependent placement errors during assembly.
How does SMBJ18CAHE3_B/I compare to SMAJ18CAHE3_A in terms of surge handling?
The SMBJ18CAHE3_B/I delivers 600 W peak pulse power (10/1000 µs), whereas SMAJ18CAHE3_A is rated for 400 W-33% less energy absorption. This difference arises from the SMB package's lower thermal resistance (RθJA = 100 °C/W vs. 140 °C/W for SMA) and optimized chip geometry. For applications exposed to IEC 61000-4-5 Level 4 surges, the SMBJ18CAHE3_B/I provides superior margin and longer lifetime under repetitive stress.
What is the clamping voltage of SMBJ18CAHE3_B/I at its rated surge current?
The SMBJ18CAHE3_B/I clamps to a maximum of 29.2 V when subjected to its rated peak pulse current of 20.5 A (10/1000 µs waveform). This VC value is measured under standardized test conditions with 0.2" × 0.2" copper pads and defines the upper voltage limit imposed on protected circuitry during transient events. A clamping ratio of ~1.45 (VC/VBR) confirms efficient voltage limiting essential for safeguarding 3.3 V and 5 V logic components.
SMBJ18CAHE3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 20.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ18CAHE3_B/I FAQ
1.How can I place an order for SMBJ18CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CAHE3_B/I on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMBJ18CAHE3_B/I reliable?
The price and inventory of SMBJ18CAHE3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ18CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CAHE3_B/I?
SMBJ18CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CAHE3_B/I order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMBJ18CAHE3_B/I?
For technical support, including SMBJ18CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CAHE3_B/I requirements.
6.How does Aetrix verify that SMBJ18CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ18CAHE3_B/I products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMBJ18CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ18CAHE3_B/I?
All SMBJ18CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CAHE3_B/I, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMBJ18CAHE3_B/I part is unused and in its original packaging.
Return procedure for SMBJ18CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CAHE3_B/I Tags
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